1887

Abstract

A set of pneumococcal strains containing immediately adjacent or nearby double mutations at the locus, conferring resistance to amethopterin, has been isolated by oligonucleotide site-specific mutagenesis. Repair of these double mutations has been measured by transformation of wild-type strains with DNA extracted from these strains. In several transformations we have observed an inhibition of repair by neighbouring mismatches. This inhibition ranges from mild to severe depending upon the interfering mismatch. Unrepaired mismatches can strongly inhibit repair of an adjacent repairable mutation. This suggests that the repair-complex proteins attach not only to repairable mismatches but also to some mismatches known to escape the repair system.

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/content/journal/micro/10.1099/00221287-134-11-3019
1988-11-01
2021-10-25
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